Mom knew.
Who would have thought that moms knew something about Chinese medicine? At one point, my mom had told me don't do anything during the day that would keep you awake at night. In Chinese medicine, there is a diagnositic system based on the clock. Between 11 p.m. and 1 a.m., we refer to that time as the gallbladder time. No, not the actual gallbladder, but it does refer to the emotions associated to the gallbladder which are aggrevation or frustration or difficult decisions that have to be made. You won't be able to sleep during those times.
Between 1 a.m. and 3 a.m. is liver time. Again, don't panic, your liver is fine. It means your are really annoyed and angry.
Between 3 a.m. and 5 a.m. is lung time. Those times are when the concepts of grief and sadness are messing with your mind.
It doesn't have to be a current issue, it could be something that you haven't dealt with in awhile. But believe me, it is in there. Sometimes when we put things away to deal with another day, that day never seems to come around. But believe, those issues are in there and sometimes there isn't a resolution, but there can be acceptance. Through acceptance we could often move on.
Who knew moms were so smart.