a of a verb or voice : showing that the subject of a sentence is the one doing the action expressed by the verb. âPickedâ in âI picked the applesâ is an active verb because it shows that the subject âIâ is the one who picked the apples.
Sleep deprivation is the condition of not having enough sleep; it can be either chronic or acute. A chronic sleep-restricted state can cause fatigue, daytime sleepiness, clumsiness and weight loss or weight gain. It adversely affects the brain and cognitive function. However, in a subset of cases sleep deprivation can, paradoxically, lead to increased energy and alertness and enhanced mood; it has even been used as a treatment for depression (see below). Few studies have compared the effects of acute total sleep deprivation and chronic partial sleep restriction.
Twenty-four hours of sleep deprivation has been found to affect the functional connectivity between the inferior frontal parietal region (IPS) and the parahippocampal place area (PPA). However, sleep deprivation does not affect the attention modulation index of the PPA.erotonin levels (in the form of 5-HT) have been shown to decrease during REM and NREM sleep, leading some researchers to believe that it is also involved in memory consolidation during sleep. Mice lacking the receptor gene for 5-HT engage in more REM sleep and perform better on spatial memory tasks.