Alzheimer’s disease (AD), characterized by abnormally phosphorylated tau, paired helical filaments (PHFs),
neurofibrillary tangles (NFTs), deregulated mammalian target of rapamycin (mTOR), Aβ deposits, is a multifactorial
disease with sleep disorders being one of the causative agents. Therefore, we have reviewed the literature and have tried to
decode the existence of positive feedback, reciprocal and a bidirectional relationship allying between sleep disturbances and
AD. Much light has been thrown on the role of tau pathology and amyloid pathology in sleep pathology and its association
with AD pathology. We have also discussed the role of melatonin in regulating sleep disorders and AD. The neuroprotective
action of melatonin via inhibiting tau hyperphosphorylation and Aβ deposition has also been pondered upon. Moreover,
astrocytes involvement in aggravating AD has also been highlighted in this review. Several therapeutic approaches aimed at
improving both sleep disorders and AD have been duly discussed such as administration of antidepressants and
antihistamines, immunotherapy, metal chelators, melatonin supplementation, light therapy and physical activity. Despite
consistent efforts, the complete etiology concerning sleep disorder and AD is still unclear. Therefore, further research is
needed to unravel the mechanism involved and also to develop strategies that may help in obstructing AD in its preclinical
stage.