Sleep.

 From personal experience, I realized that the amount of sleep and the amount of stress have a strong relation. Around last year's October-November, staying up until 1am to 2am was a usual-regular basis thing. Sometimes I was burning midnight oil until 4am when I had test or report due in the next morning. Despite the effort, I had to face the negative consequences. Not only the productivity and mark went down because of the stress, the circadian rhythm has changed due to nap in the afternoon and no sleeping in the night. Most of all, I became low on daily mood, motivation for work, and self-esteem for long time. Since the beginning of this school year, I draw myself a line at 12 am to prevent what happened last year. I've paid expansive lesson to learn the fact that 'sleep is not something to be given up easily'. This also reminded me the fact that 'sleep deprivation kills a human faster than food deprivation.'
 Anyway, the original reason I'm writing about 'sleep' is because I started to take a shower right before going to sleep. It's a great feeling to take a relaxed shower after all the day's work and to be in a bed where everything feels much softer. Most of all, It helps to fall in sleep faster and wake up easier in the morning. Warm milk is the popularly known way to get a good night's sleep, but I think taking a shower too. Try it.

ps) Oops It's past 12 already.