Because hot water can raise your blood pressure rapidly. Otherwise you'd be refreshed and energetic.
"I feel tired" would be "Siento cansado"
Simply when the temperature outside the shower is less than inside the shower the person would feel colder than when they were previously in the shower.
Maybe to feel powerful, or he just feels like a chicken! Just try to make him feel better, but don't hit him!
A shower may make you feel a little better.
A hot shower always makes me feel better.
Your girlfriend may refuse to get in the shower because she is shy or does not feel comfortable taking a shower at your place. The best way to establish the reason she won't get in the shower is to ask her in a friendly way and avoid making her feel uncomfortable.
Hygenic
Maybe, he could be emotionally/mentally tired, not just physically.
If you use tapwater, you may feel cold but if you use a heater, you wont feel cold.
Tierd from all their running around.
when you get tierd
no they get tierd