Non-rapid Eye Movement Sleep - Dreaming During NREM

Dreaming During NREM

Although study participants' reports of intensified dream vividness during REM sleep and increased recollection of dreams occurring during that phase suggest that dreaming most commonly occurs during that stage, dreaming can also occur during NREM sleep.

Research has also shown that dreams during the NREM stage most commonly occur during the morning hours which is also the time period with the highest occurrence of REM sleep. This was found through a study involving subjects taking naps over specific intervals of time and being forcefully awakened, their sleep was separated into naps including only REM sleep and only NREM sleep using polysomnography. This implies that the polysomnographic occurrence of REM sleep is not required for dreaming. Rather, the actual mechanisms that create REM sleep cause changes to ones' sleep experience. Through these changes, by morning, a sub-cortical activation occurs during NREM that is comparable to the type that occurs during REM. It is this sub-cortical activation that results in dreaming during the NREM stage during the morning hours.