Sleep can only occur if optimum body and brain temperature is reached.
IS THE QUALITY OF REM SLEEP DIFFERENT IN POST-TRAUMATIC STRESS DISORDER (PTSD) AND MAJOR DEPRESSIVE DISORDER (MDD)?
PTSD patients tend to have reduced REM sleep, while MDD patients spend too much time in REM sleep.
DOES SLEEP DEPRIVATION INCREASE ANXIETY?
Sleep deprivation increases anxiety, especially after more than 72 hours of no sleep.