My female betta likes to sleep in her "hammock", a plastic banana plant leaf that i float in her tank. Sometimes she's so deeply asleep that i can wave my hand frantically in front of her and she goes on snoozing. scared me the first time, thought she was dead.
So i gave both the boys "hammocks", and they ignore them completely... go figure... never can please a man! lol.
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blue male VT betta - 1 gal.
pastel/cambodian male VT - 2 gal.
red & blue female betta (i think she's VT) - 1/2 gal.