Why do I feel weak/tired after eating? [Solved]

I'm a 19 year old guy and for two weeks now, when I eat I feel weak and a strange feeling like I'm going to faint. I have twice fell asleep in the mess room after eating - please help me.
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2 replies

Thank you
It is common to feel sleepy after eating and it seems that you lack sleep, are you having enough hours of sleep?
Kind regards.
Respond to Reeves
Thank you
Yes I lack sleep. So this is why I have this problem, thanks very much. I will watch on having enough sleep.
Thanks again.
Respond to Mead