Can liking someone affect your appetite and sleep?

For the last month or so I haven't been eating nearly as much as I normally do, and I have had a hard time getting to sleep and when I finally do I wake up two or three times during the night. Then a few days ago I tried to find out when this started and I think it started around the time I began to really like a girl that sits in front of me in class.

Do you think that these are related or is it just a coincidence?
Can liking someone affect your appetite and sleep?
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