Long Showers

If you have a habit of taking long warm/hot showers, it could be sign of sleep deprivation and/or depression. This is especially the case if you sit down in the shower.

The reason it feels good is two fold. First, your body is able to save a bit of energy that it'd otherwise need to use to keep your body warm. Secondly, the warmth of the shower also helps combat loneliness, since it replaces the warmth of human interaction.