Why do people get depressed (or do they)

around their family members (since departed this realm) birthdays or anniversaries? Some times, we dont even realize it.

Just asking. My mom has been dead 3 1/2 years and yesterday would have been her 78th birthday. I have been feeling "punk" due to my cold, but I didn't realize until today that yesterday was the tenth. I have been a day off all month. I thought Saturday was the tenth. I have no motivation to get moving. WHY is that?