Parasites will affect your immune system and your gut function, as well as taking nutrients from your body. This can cause tiredness and lack of energy. In general, any parasite infection can cause this, since the Parasites by definition lives from your nutrients or blood. Since your body is working to rid you of the parasites, this takes energy from you as well, and this continues when your body should be resting at night. Parasitic infections can cause sporadic symptoms, thereby making them very hard to diagnose without a proper test. In general, if you slept well through the night and wake up by yourself, you should not be tired – if you are, there is most likely a reason for it – and we are happy to help you with the parasite possibilities.
Giardia Lamblia is a parasite that can cause tiredness as well as iron deficiency – Read more here.