I have a 20 month old son and a 4 month old daughter And for the last 3 weeks I have been getting less than 4 hours sleep out of 24 every day. I am so tired that I cAn hardly function. As soon as 1 wakes up they wake the other and then play tag team all night. Neither settle themselves and neither naps for more than an hour in the day (never at the same time). I have no idea what to do - help!