"deep nap" is a correct and usable phrase in written English.
It is typically used as a noun phrase to describe a deep, restful nap. For example, "I took a deep nap and felt much more alert afterwards."
Overnight guests have a few more options: the thick pillows and generous breezes in the bedrooms make for deep napping, shelves of board games and a working Victrola offer good, clean turn-of-the-century fun in the parlor, and, in season, you can always go for a swim.
In another study conducted by Simon Durrant, a professor at the University of Lincoln, in England, the amount of time a subject spent in deep sleep during a nap predicted his or her later performance at recalling a short burst of melodic tones.
They found that the concentration of adenosine rises steadily during periods of alertness, when the brain uses the most energy, and drops during naps or deep sleep.
Robert Stickgold, a professor of psychiatry at Harvard Medical School, proposes that sleep — including short naps that include deep sleep — offers our brains the chance to decide what new information to keep and what to toss.
We experience both REM and Non-REM sleep (aka deep sleep) at night and during naps, provided the later aren't too short.
One sublime pleasure was taking a deep afternoon nap on an incredibly smooth, flat rock in Doctors Cove in La Manche Provincial Park.
Following the training, participants took a 90 minute nap and once they entered a deep sleep, without their knowledge, one of the sounds was played repeatedly.
Booij agrees: "We've seen that a power nap can help a person catch up on deep sleep," she explains.
The subjects napped 90 minutes or less, long enough to experience slow-wave or deep sleep but not REM sleep.
