Can hot and cold showers shift rhythms?

Hot and cold showers can indeed influence biological rhythms, specifically the circadian rhythm, which is the body's natural day-night cycle. Andrew Huberman discusses how exposure to different temperatures can impact our body's internal clock.

1. Cold Showers: These can increase alertness and potentially reset the circadian clock by influencing the release of certain neurotransmitters like norepinephrine. The shock from the cold water can signal the body to adjust its preparation for sleep or wakefulness.

2. Hot Showers: Taking a hot shower can increase body temperature initially, but the subsequent cooling down period can help signal the body that it's time to prepare for sleep. This mimics the natural drop in core temperature that helps initiate sleep.

It's important to time these showers correctly to effectively shift the circadian rhythm. For example, a cold shower in the morning can help signal the body to wake up, while a hot shower in the evening can be part of a winding-down routine.

These temperature-based practices can be part of what's often referred to as "temperature anchoring," a method to reinforce the natural fluctuations in body temperature that align with our circadian rhythms and can aid in better sleep and alertness during the day.