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.
Habits. Sleep: If you are feeling tired, you may get into the habit of sleeping in the day. This can make it more difficult to 'switch off' at night and get a good night's sleep. Sleeping too much: it sounds odd, but this too can make you tired-perhaps because it reduces your fitness.abits. Sleep: If you are feeling tired, you may get into the habit of sleeping in the day. This can make it more difficult to 'switch off' at night and get a good night's sleep. Sleeping too much: it sounds odd, but this too can make you tired-perhaps because it reduces your fitness.