Cheers for all the comments. I don't feel so alone now

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Fortunately Riley (eldest) is a pretty good sleeper and tends to sleep straight through (just not at the moment while he is sick). He used to get up after 7 but now wakes around 6. Not good if I want to do an imaging run. I could manage sleep from about 1-7 but struggle with less than that.
Charlotte is also a very good sleeper, despite a heart condition. She goes down at 7, mummy feeds her at 11 (plus medicine) and then doesn't wake up until 2.30-4 when I feed her, then sleeps until 6-7.30. She also puts herself back to sleep very easily which is in complete contrast to what Riley was like. Mind you, he had pretty bad reflux.
I estimated around the time Charlotte is 6 months that I could spend a little more time outside. This was based on the age Riley slept through the night. Going by some of the comments here, it could be a few more years yet. Damn, I just picked up a modded dslr just before Charlotte was born. It's just sitting in the study waiting to be used