Why am I getting so tired so early?

I'm 21 years old, and in good health. I exercise regularly, I am not overweight, I don't smoke, rarely drink, and have no current health issues that I think could cause this?
I am on vyvanse 40 mg for ADHD.
I am usually quite energetic throughout the day, but once I get home, at around 6 or 7, I'm so exhausted my eyes hurt and I can hardly keep them open. It feels like I've been awake for days.
What could cause this? I usually have a coffee at around 8 am, if I have one at all, I try and limit my sugar, and most of my nutrients come from Ensure (I have a very small appetite due to my medication) or fruits and veggies.
My sleep schedule is kind of off though, I usually go to bed at 12-1 am and wake up at 8 to go to school, and I wake easily during the night so I sleep with ear plugs. The bed I have in my boarding house is extremely uncomfortable so I usually wake up sore. On weekends I sleep in, but today for example I went to bed last night at 2:30 am, and I woke up at noon today (awful, i know, thats unusual for me) and its 7pm and I'm ready for bed. I haven't even done much today.
Is it anything listed above or...?

?2015-04-03T20:47:37Z

Fatigue is often due to an unhealthy lifestyle.

Fatigue often triggers off further problems such as headaches, migraines, dizziness, lightheadedness, shakiness and nausea.

To combat fatigue the energy vitamin B12 can help or a vitamin B complex. Coenzyme Q10 can also help to boost your energy level and the super food Spirulina is another good energy booster.

Nuts can give you lasting energy.

One of the most common fatigue causes is anxiety which is a state of fear of real or imagined danger, which is manifested as increased heart rate, trembling, panic, weakness, extreme fatigue and stomach or intestinal discomfort.

Besides anxiety there are many other common fatigue causes such as insufficient sleep, too much sleep, under eating, thyroid problems, iron anemia, mononucleosis, CFS, glandular fever, side effects from medication, dehydration, overexertion and an unhealthy diet.

Bethany2015-04-03T15:12:38Z

Usually when I get to feeling that way it's because I am anemic. You can check by going to the doctor and getting a blood test, but I usually just buy iron pills and feel better within a couple days. You can take too much so be careful. Hope you feel better!

Hope you dont feel offended but It could also be a sign of pregnancy.

?2016-04-22T05:55:22Z

Thyroid disease is one of the most common health problems we face today. From a practical standpoint, there are many ways to approach this issue. Learn here https://tr.im/v3fh3

Hypothyroidism, or underactive thyroid, is a very common problem, and there are many reasons for this, including drinking chlorinated and fluoridated water, and eating brominated flour.

Chlorine, fluoride, and bromine are all in the same family as iodine, and can displace iodine in your thyroid gland.

Secondly, many people simply aren't getting enough iodine in their diet to begin with. The amount you get from iodized salt is just barely enough to prevent you from getting a goiter.

?2017-02-24T12:05:21Z

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?2017-01-26T15:27:07Z

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