Loosing my mind??

So I have been telling everyone that I am feeling GREAT after having Tyler and things are going really well. This week I finally came to the conclusion that maybe I am NOT doing as well as I think I am . . . I think lack of sleep IS affecting me more than I thought it was. I swear sometimes I am loosing my mind! I think that I have been feeling good EMOTIONALLY- I feel lots of energy in that regard, which is so much better than after Lillian was born when I felt a bit depressed. It is amazing how if emotions are OK, everything else seems OK. BUT after several times of completely missing the mark, I realized I am not super-human. I know I am not getting enough rest (mostly because of Tyler, despite my best efforts), but I push through each day becoming more and more tired. Being the mother of four children, especially during this time of year whe I have SO much to do, I don't really get to nap ever. I don't mind sacrificing my own rest for the rest of the family (I adore our new WONDERFUL little boy!)- and for Jon who has to work so hard, but the cumulative lack of sleep I think is finally starting to really get to me! In the last month or so, I have run out of gas for the first time in my LIFE, shown up to a visiting teaching appointment on the wrong day, and forgotten things needed for errands (like driving all the way to the post office to mail a package, and I didn't bring the address . . . Or not having my WIC folder at an appointment, or not having an insurance card at the doctors, OR forgetting the coupon I went specifically to a certain store to use . . . ). I have gotten times of events completely mixed up (on more than one occasion), forgotten names of people I know really well - - and even WORDS for every day things. I can't carry on a conversation without stumbling over my words or repeating myself. My husband laughs when I say things like "can you get me that THING, over by . . . (I never quite finish) . . . I also find myself craving sweets and diet soda. Hmmm- in the past I was a fairly well put together and organized person (at least I think I was!). What is wrong with me?? I guess I really DO need that sleep I am missing. I don't think it just started after Tyler was born, I think it has been going on ever since Jon started his residency- and just got WAY worse after he was born. So- how can I get back that rest I have been missing with the life I currently lead?