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4 Answers
- ConnorLv 79 years agoFavorite Answer
This is a question that has many theories in the scientific world but there are no proven answers yet.
The biggest theory is that dreams before waking cause them or that blood circulation is clearest in the morning making it much easier to become erect.
There are major myths out there that it has something to do with urination or a full bladder. This isn't true. Those myths have bee debunked.
-Connor
Source(s): Pre Med - AragornLv 79 years ago
They have higher testosterone levels in the morning. Guys also have nocturnal erections much of the night. All of that is perfectly normal. You only have to worry about it when you STOP getting regular erections, although it certainly makes it more difficult to take a morning piss!
- Dan HLv 79 years ago
You are relaxed, your brain is slowly coming active and we are often horny.
It doesn't always happen, though men tend to get several erections during a night of sleep.
- Anonymous9 years ago
because they are thinking of your hot mouth