Special caution is required when treating patients with bipolar or psychotic disorders, as well as those with unstable somatic illnesses. Sleep deprivation (a side effect of bedtime restriction) can trigger changes in mood episodes or decompensation. In these cases, bedtime restriction should be approached cautiously and closely monitored. It should be emphasized, that the program does not aim to reduce total sleep time, but rather to reduce unpleasant time in bed, thereby promoting better—and possibly even longer—sleep.