Napping well: length, timing and traps
A short nap can reset your afternoon
Dr. Nadia Selmi
Sleep specialist
In simple terms
Twenty minutes restores alertness; ninety minutes suits shift workers.
The two useful nap lengths
A short nap of 10 to 20 minutes keeps you in light sleep and restores alertness quickly, with almost no grogginess. A full cycle of about 90 minutes includes deep and dream sleep and suits night workers or a big sleep debt.
Avoid the in-between
Waking from a 40 to 60 minute nap often means being pulled out of deep sleep, which causes that heavy, confused feeling called sleep inertia. It can last 20 to 30 minutes.
When to nap
Early afternoon, roughly between 1 and 3 pm, matches the natural dip in alertness. Napping after 4 pm eats into the sleep pressure you need at night.
When napping is a warning sign
Needing long daily naps despite sleeping 7 to 8 hours at night can point to sleep apnoea, anaemia, depression or a thyroid problem. That deserves a medical check rather than more naps.
When should you see a doctor?
- Your symptoms last more than a few weeks or keep coming back.
- They get worse quickly, or stop you doing everyday things.
- You notice sudden pain, breathing trouble, fainting or bleeding — seek urgent care.
- You already take medication and want to change anything about it.
This article explains general health information. It does not replace advice from your own doctor.
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