My betta treated it as his feeding station, not as a resting spot. Not sure if it's because he was a king betta. Maybe he thought it was too small - he preferred to sleep on top the filter and ignored all the other surfaces I made for him, including the betta log. He only went into the log if the current was too strong.
He let me know he was hungry by tapping the tank with the thermometer to get my attention, them swimming to the leaf hammock.