Baby blues

A few days after my son was born I was hit by the baby blues. Inexplicable tears and sadness are really not helped by sleepless nights! And a couple of days ago I burst into tears just looking at my little boy for no reason other than he is so sweet and cute and perfect and I love him more than I could ever imagine loving anything, and I can't believe he's mine. What a basket case! Anyone know how long this madness is going to last?