Keep a hold of those memories, put them in a brain pocket (my term) so that you can take them out when things don't feel so good. I look at my sleeping 12 year old every morning before I wake her and her mouth curls just like it did when she was a baby - I don't actually want to wake her for school, I want to stay in that moment forever and see that little baby in her face. But then she's up and about and busy and beautiful in a 12 year old way. But it is something I try and reflect on during the day (when it's possible to reflect, and I have to face it, sometimes I just can't, particularly when manic), because it shows me how there is happiness in my life in little moments that need to be savoured and held on to.
PS ordered a copy of The Happines Project - sounded too good to miss.
ah....bliss - grandbabies - hugs - family...you have been Blessed
Happy for you. Your post makes me smile and brings back my own happy memories of grandchildren and hugs and kisses and all that good stuff.