Waking in the middle of the night.

For some reason I keep waking up in the middle of the night and am unable to get back to sleep. It always seems to happen at the same time every night. I wake up at 3:00 AM and just lie there staring at the ceiling. I imagine that if this continues I will need to look for the best eye cream for dark circles. In the past I could generally get back to sleep by doing math calculations. For some reason the process of multiplying or dividing makes me dreadfully tired. This little trick doesn't seem to be working any longer. There must just be something going on with my internal clock that will just take time to recalibrate. Hopefully, that will happen very soon.