My male guppy Shifu is one tough cookie. He has survived the ups and downs of a new tank owner. Well that strength must come from a great nights sleep. As a night shift worker I'm up at night home and I noticed that Shifu likes to dig himself into the gravel to sleep. The first time I saw this, quite frankly I thought he had passed. So I did what anyone would do, I tapped the glass and woke him up! He was furious and basically told me exactly what he thought of being awakened from his slumber. I thought this was hilarious. I'm surrounded by grumpy boys in the morning, a grumpy husband, grumpy 4 year old and now a grumpy guppy! Does anyone else have fish with funny sleep habits?