List of United States Presidents by military rank. The United States Constitution names the President of the United States the Commander-in-Chief of the U.S. armed forces. Many Presidents, however, also served in the military before taking office; all but 12 of 43 served. 1  1 Table of United States Presidents by military rank.  1.1 General of the Armies.
It is called circadian rhythms. Humans tend to sleep when it is dark out. I, on the other hand must work all night and sleep in the day. so my natural rhythms are screwed up. Being bored makes us sleepy, reading and watching TV makes me sleepy also physical tiredness.
If youâre getting enough shut-eye but still feel sleepy all the time, you could have a sleep disorder. Sleep disorders disrupt a person's ability to fall asleep or stay asleep, or they may cause odd behaviors during sleep, such as sleepwalking. Some sleep disorders even prompt sleep attacks, in which people fall asleep uncontrollably during the day.