biological rhythms (e.g., body temperature, hormones). These disruptions may trigger episodes of mania or depression [55]. Studies have found that exercise is a key zeitgeber, or time cue, that helps to entrain other social rhythms [56, 57]. Thus, exercise could help to stabilize one’s routines by both entraining rhythms, such as sleep, as well as improving sleep quality [58]. Additionally, previous research has shown that exercise is associated with fewer night time awakenings and less time spent in stage 1 sleep, thus improving sleep quality [59]. Data has also found that sleep disruptions are associated with changes, or reductions, in one’s exercise routine [60].
