Shower after a hard day at work is useful. You need it after your workout session in the gym as well. You may take a bubble bath before you go to bed. Hot shower and bathing help us relax and prepare our body for sleep. If this is what you have always done, then it’s alright and you should look for the reasons why your sleep is poor elsewhere. But if you have just recently started bathing in shower before the bedtime, then it very well might be the cause. The explanation is simple. You give the wrong signal to your brain waking it up, just the way you do it in the morning. Another thing to remember is to dry your hair very well before you go to bed. Sleeping on a wet pillow is neither comfortable nor healthy.