Stress is one of the most common causes of sleeplessness, and soaking in a hot tub is one of the best ways to relieve stress. Studies have found that immersion in warm water before bedtime can ease the transition into a deeper, more restful sleep. This may happen because the body’s core temperature drops after leaving the water, which the brain may interpret as a cue for sleep. Or perhaps people sleep better after hot tubbing because buoyancy reduces body weight, relieving pressure on joints and muscles, creating a total physical relaxation that translates to emotional relaxation, aiding sleep. Even the National Sleep Foundation recommends soaking in a hot bath or hot tub as part of a regular, relaxing, healthy bedtime routine.