Sleep is critical for human life.
Grossly disrupted or disturbed sleep is often an early indicator that something is going wrong. Many neurological and endocrinological problems have disturbed sleep as a symptom.
Disturbed sleep can cause physical distress as well as mood and psychological issues(*). And physical distress, as well as psychological and emotional issues, can also cause disturbed sleep.
Teasing out what is causing what and, more importantly, addressing the issues that need to be addressed, can be a daunting task.
