For most adults who feel sleepy during the day, a nap of about 15 to 20 minutes is a useful starting point. It can improve alertness without making it as likely that you wake up groggy. Try napping in the early afternoon rather than near bedtime. A nap can help temporarily, but it does not replace enough nighttime sleep or explain persistent, unexplained tiredness.
Daytime tiredness can make it harder to concentrate, stay productive, and enjoy daily activities. A short nap may help you feel refreshed, particularly after a poor night's sleep or an unusually demanding day. The best nap length depends on your sleep needs, daily schedule, and how easily you become groggy after waking. Understanding when to nap and when tiredness deserves further attention can help you make the most of daytime rest.
What is the ideal nap length for daytime tiredness?
For most adults following a daytime schedule, aim for approximately 15 to 20 minutes of sleep. This short rest can improve alertness while reducing the likelihood of waking from deeper sleep and feeling sluggish. The National Institute for Occupational Safety and Health (NIOSH), part of the CDC, recommends brief naps for daytime workers because they can improve alertness with less post-nap grogginess.
A practical approach is to set an alarm for approximately 20 to 30 minutes, allowing a little time to settle down and fall asleep. You may sleep for less time than the alarm interval. If you tend to fall asleep quickly, a shorter alarm may be sufficient. The aim is to take a brief restorative break rather than replace your usual nighttime sleep with a long daytime session.
Why can a longer nap leave you feeling more tired?
Sleep does not remain equally light throughout a nap. As you continue sleeping, you may enter deeper stages of sleep. Waking during deeper sleep can lead to sleep inertia, a temporary period of grogginess, confusion, or reduced alertness. This can make it difficult to return immediately to work or other activities that require concentration.
The Mayo Clinic explains that naps lasting about 15 to 30 minutes can be helpful, while naps that are too long or too close to bedtime may interfere with nighttime sleep. People who are significantly sleep-deprived may enter deeper sleep sooner and experience more grogginess after waking, even following a relatively short nap.
Longer naps are not always unhelpful. People working night shifts or managing particular sleep disorders may need a different sleep plan. However, if your main goal is to feel more alert during an ordinary afternoon, starting with a brief nap is generally a practical choice.
When is the best time to take a nap?
The early afternoon is often a convenient time to nap because alertness naturally tends to dip during this part of the day. Taking a short nap around 2 or 3 p.m. may suit some adults, although the best time depends on their work schedule and usual bedtime. Avoid making naps so late or so long that they leave you less sleepy when it is time to go to bed.
If you have difficulty falling asleep at night or regularly wake during the night, consider whether daytime naps are contributing to the problem. Keeping naps brief and taking them earlier may help. If nighttime sleep continues to be disrupted, discuss your sleep pattern with a healthcare professional instead of repeatedly adjusting your nap schedule without addressing the underlying problem.
How can you make a short nap more refreshing?
A few simple adjustments can make it easier to rest without letting a short nap become a long sleep period.
- Set an alarm: Choose a time that allows for a brief nap rather than an extended sleep.
- Find a quiet place: Reduce noise, dim the light, and choose a comfortable setting where you can rest without interruption.
- Nap earlier in the day: Prefer the early afternoon over the late afternoon or evening, particularly if nighttime sleep is already difficult.
- Allow time to wake up: Give yourself a few minutes to become fully alert before returning to demanding activities.
- Keep a regular sleep schedule: Going to bed and waking up at consistent times can support a more predictable sleep routine.
The Centers for Disease Control and Prevention (CDC) emphasizes that good sleep depends on both how long you sleep and how restorative that sleep is. Adults generally need at least seven hours of sleep each night, although needs vary with age. A daytime nap may help with temporary tiredness, but it should not become a regular substitute for adequate nighttime sleep.
Do children and older adults need a different nap length?
The 15-to-20-minute starting point is intended mainly for adults who want to improve daytime alertness. It should not automatically be applied to infants and young children, who have different sleep needs and developmental patterns. Babies, toddlers, and preschoolers may need regular daytime naps as part of their total daily sleep.
According to HealthyChildren.org from the American Academy of Pediatrics, older children, teenagers, and adults can generally limit daytime naps to 20 to 30 minutes to help avoid interference with nighttime sleep. Older adults may also benefit from brief daytime rest, but persistent sleepiness should not automatically be attributed to age. Nap timing and duration are best considered alongside each person's nighttime sleep and daily routine.
When is daytime tiredness a reason to seek medical advice?
Occasional tiredness after a late night, a demanding day, or a change in routine is common. However, needing a nap every day does not necessarily mean that you are getting enough restorative sleep. Ongoing tiredness can be associated with insufficient sleep, stress, medication effects, sleep disorders, or other health concerns.
The NHS guidance on tiredness and fatigue recommends seeking medical advice when tiredness continues for several weeks without a clear explanation, affects daily life, or occurs alongside other concerning changes. A healthcare professional may review your sleep habits, medicines, medical history, and other symptoms to decide whether further assessment is appropriate.
It is particularly important to seek advice if you frequently fall asleep unintentionally during the day, remain sleepy despite getting enough nighttime sleep, or experience sleepiness that interferes with work and everyday activities. The NHS information on excessive daytime sleepiness explains that a healthcare professional may ask about sleep patterns, medical conditions, and medicines, and may recommend a sleep diary or specialist assessment.
If you feel drowsy while driving or performing a task that requires full attention, do not rely on a short nap alone to make the activity safe. Stop the activity and resume only when you are fully alert.
How should you decide whether to nap or rest another way?
If you had an unusually short night and feel sleepy in the afternoon, a brief nap may provide temporary relief. If you feel tired but cannot fall asleep, taking a quiet break may still offer an opportunity to rest. However, persistent sleepiness calls for more than experimenting with nap lengths. Review whether you are getting sufficient sleep at night, and seek professional advice if daytime tiredness continues or interferes with normal activities.
The main goal is to use naps as a helpful addition to a healthy sleep routine. For most adults, beginning with about 15 to 20 minutes in the early afternoon is reasonable. If naps regularly leave you groggy, delay your nighttime sleep, or seem necessary just to get through the day, reassess the pattern and consider discussing it with a healthcare professional.