By stimulating blood flow to the hands and feet, warm water allows heat to escape the body more quickly, allowing the body to doze off faster.
Further research has suggested that bathing in water at this temperature may also help lower blood pressure before and during sleep.
These effects are most pronounced when taking a shower less than an hour before bedtime, it’s been established.
Conversely, showers that are too cold may be detrimental because this raises cortisol levels in the body.