It's possible that your periods are beginning to stop. That's one of the features of this wonderful time of life - your periods will do all kinds of wacky things.
For some lucky women, they'll just stop completely and that's it. For some, the periods get closer together, or further apart, skipping some months all together, or having constant bleeding for several weeks. It's so different for every woman.
Let your doctor know, though, just so s/he can allay any fears that you may have.
I have all the same syptems as you i'm 41 was wondering did you go and get hormone levels checked and if so what did they show. Have been to see doctor mostly about spotting week before period which is new to me also sleeping is so much worse periods are shorter 3 days cycle about 27 days. doctors says to get blood sample done and see result and then have hrt which I have to say I do not really want to take . hope you do not mind me asking.
ThanksPauline