I usually squeeze the bulk of art last thing at night partly because that's about the only time I have left and mostly because I'm an owl and that's when I work best, I'm pretty useless before the morning coffee XD Can usually cobble together some semblance of coherence to construct hive comments but sense is not guaranteed XD
I definitely can work late into the night also! I love first thing in the morning, and last thing at night to get creative!