What's your sleep routine actually like?
Do you get off to sleep easily, or does it take a while?
And do you perhaps have a TV on or music in the background while you sleep?
Some people find noise or light from a TV/music player to be soothing, but for some it can disturb them, even if they're asleep it can affect them.
Also, what is your morning routine?
Particularly in concern for breakfast.
Are you eating a breakfast that is high in carbohydrates. You want slow-release energy.
So, toast and cereal (like shredded wheat, or porridge) is very good for you.
Don't forget to eat a healthy lunch too. Doing this at around Noon is good, since it will give you energy over that 1-2 O'Clock period that you feel sleepy.
Again, make it a balanced meal. Don't just take up lots of sugar. That's not good for your body and it doesn't last.
A nice sandwich and a packet of crisps is generally pretty good for you. Plenty of carbohydrates, you can have your greens in the form of salad and your salt/fat/sugar is taken up by the crisps.
A Ham sandwich, with some salad leaves (perhaps some tomatoe and/or cucumber) is a great lunch time meal.
If you're still feeling sluggish, then try a small cup of coffee, or a cereal bar.
Just don't overconsume on these. Lots of caffeine isn't great for you, nor is the sugar you may have in it.
And cereal bars often contain some chocolate. If you're eating entire packs of cereal bars, that's not good for you.
You also want to approach what your dinner is like.
It might be after your afternoon-napping period, but getting that right is also important.
Again you want balanced meals in good portions. (According to a health/fitness programme I watched recently, a good meal should fit entirely within your two hands cupped together. More than that and you're overconsuming).
Finally, what do you do during the day?
You want to have an active day time. Doing something to get you working is always great.
Whether that's working a job, studying, cleaning the house, going out exercising (or doing it at home), doing some puzzle books or anything else that takes your physical and/or mental concentration.
There's no point in spending the day lounging about on the computer or playing games.
That doesn't take all that much energy and can make you quite lethargic.
Boredom can strike in quite quickly, and following that it's not difficult at all to just try sleeping.
So, as much as you can, try to keep yourself occupied with other things too.
You want to push yourself so that you're only tired at the end of the day.
That's the right time to rest and relax and finally sleep.
