It is not uncommon for young men, often teenagers, to get a lot of random erections throughout the day. It does not always mean that the man is in the mood. Random erections help to keep the penis healthy by supplying it with enough blood.

Check this site out for more information:

"Am I Getting Too Many Erections?

Because each person is so different, it's impossible to say what's a "normal" number of erections. Some guys experience many erections each day, whereas others may not experience any. Hormones fluctuate with age, sexual maturity, level of activity, and even the amount of sleep a guy gets. Unless your erections are causing you discomfort or pain, don't worry about how many you get. If you're concerned, it's a good idea to talk to your doctor. He or she can answer your questions and will probably put your mind at ease."
http://www.kidshealth.org/teen/sexual_heal th/guys/normal_erections.html

How come we get boners in the morning. I find it quite odd. It just so random, you wake up, and it's up lol. I know it's normal and all, but why does it occur?

There may be several reasons for morning erections. It's possible that you were having a sexy dream. It's possible that you were just having an erection for no reason like you do during the day.

It is also said that a full bladder will press on your prostate, causing an erection. I've even heard it said that it's meant to actually hold in your urine because it is difficult to urinate with an erection.

Another theory is similar to what Llewellyn said about penis health. The penis, like any part of the body needs oxygen, and erections are the bodies way to ensure the penis gets enough blood, and therefore oxygen. Incidentally, oxygen levels are higher at night which may lead to more erections.

The blood flow issue mentioned above is usually the reason for it, it will happen throughout the night as well.