Sleep studies provide enough evidence that napping reduces sleepiness while improving cognitive functioning, psychomotor performance, short-term memory and mood.
The Science of a Perfect Nap:
Power Nap: 10 to 20 minutes
Most sleep experts agree that if you want to have a quick jolt of alertness, vigour and/or decrease fatigue, take a 10 to 20-minute nap. So for example: if you are taking a road trip and begin to feel the effects of drowsiness with no Red Bull in sight, pull over to the side of the road and take a quick nap–it packs a big punch!
Grogginess Nap: 30 minutes
Some studies have shown that when you take a longer nap, the effects of sleep inertia begin to settle in after you wake up. This is the brief period of grogginess you feel when you first wake up in the morning. Your body is still in a state of rest and parts of your brain are not full awake yet. One way to combat this is to set your alarm at the end of one of your 90-minute sleep cycles, rather than in the middle of it. So the best time to wake up would be somewhere between seven and a half to nine hours after you have begun your sleep cycle.
Short-term Nap: 60 minutes
We all know that somewhere between 30 to 60 minutes is when we start to graze the surface of our deep sleep cycle. This is when our brain waves begin to slow down and will have some benefits like:
In one study, a group of researchers asked one set of participants memorise a set of cards and then told them to take a 40-minute nap, while the other group had to stay awake. After the 40 minutes, the groups were tested on the memory cards. The group who took a nap recalled 85% of the patterns on the cards, while the non-napping group recalled just a little over 60%.
It seems that napping pushes our memories to our neocortex while we sleep (our brain’s permanent storage facility), preventing us from losing any sort of data. The downside to a short-term nap is that the moment you begin to wake up, you will feel minor effects of grogginess (sleep inertia).
REM Nap: 90 minutes
And finally, we have REM (rapid eye movement) napping. This when you have reached your full sleeping cycle and dream. A 90-minute nap has been said to improve:
A nap this long helps you avoid sleep inertia and makes it much easier for you to wake up. Although sleeping for 90 minutes during the work day but it sure does have merit when you need some rejuvenation. and maybe best saved for the weekends.
Experts say that the ideal time for a person to take a nap is generally between 1-4p.m. Napping later than that could interfere with your night schedule. And, if you find yourself dreaming while you are napping during the day, this may mean that you are sleep deprived and will need to re-adjust your sleep schedule so that you can get adequate rest at night.