Wake me, it's not too normal to feel tired in P2--combined with the flu symptoms, maybe you should see the doctor? Sounds like it might not have anything to do with SBD.
Just take care of yourself, okay?
Sunny, are you getting enough P1 good carbs? Beans, legumes, bell peppers, tomatoes, etc.? If not, that might be the culprit. Being dehydrated also makes you tired (make sure you're getting 64 oz of water a day AT LEAST!), and being anemic (low on iron) can also make you tired. Are you on your TOM (or just post-TOM)? Women lose so much iron during their TOM, so if you aren't getting a lot of it in your food (spinach is a great source, as is cooking, especially tomato-based products, in cast iron pans), you might be anemic. Check with a doctor to make sure. You might want to add some light exercise, as well...it can really make you alert and awake!
If none of that works, do check with your doctor. It could be a ton of things, but it's worth finding out for sure.