Holiday nights wreck sleep with cortisol spikes, short days, and sugar crashes—delaying onset by 45-60 min and fragmenting REM. This guide compares 7 science-backed supplements: Magnesium Glycinate calms nerves fast, Ashwagandha cuts cortisol 27.9%, L-Theanine quiets racing thoughts in 40 min. Start with magnesium 60 min before bed; add ashwagandha mornings for resilience. Gift-worthy picks include premium Reishi for immunity + calm. Reclaim rest this season—no grogginess, ju