Super jealous of hearing about these blocks of sleep. The longest I have managed since zen was born was 3 hours. He is very unsettled, waking hourly, sometimes more, from about 1am onward so I try to nap in the day so I dont get all cranky sleep deprived. I thought I might get a different type of baby after DS1 but it appears DP and I make unsettled babies who scream when awake