As generally supported, a persons biological daily clock may causally be related to memory deterioration in Alzheimer’s patients and in the ageing. Synchronizing of the circadian rhythms using magnetic fields, (this article suggests) could lead to improved memory for those affected.
R. Sandyk, et al., “Age-related Disruption of Circadian Rhythms: Possible Relationship to Memory Impairment and Implications for Therapy with Magnetic Fields,” International Journal of Neurosci, 59(4), August 1991, p. 259-262.