Weight and Sleep

There's quite a bit of advice out there about being overweight and insomnia. However, I have the opposite problems: I weigh only 36 kilos at 1m53, even though I eat normally (I make sure to eat a healthy, balanced diet); I’m constantly sleepy and experience extreme physical and mental fatigue, even though I do my best to get quality sleep.

I’d really appreciate some advice on how to address these two issues.

Thank you—your app is a huge help to me.