Did you know that…..
from age 2 to 3 about every 90 min. begins a NREM period of sleep ?
Those children spend 80% of the total sleep in NREM sleep.
Normal sleep consists of cycles of REM sleep (rapid eye movement) or light sleep and NREM sleep (non rapid eye movement) or deep sleep.
(Edited by María Moya Guirao, M.D.)