The most commonly reported sexually transmitted infection in the united states is

HPV! Over 79 million Americans have it and about 14 million people be some affected every year! 80% comes from sexually active people.

Probably because you wake up early. even when i get a good nights sleep i still feel tired if i wake up early. or maybe you just need coffee.

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)