Is my Betta fish just sleeping?

Bear

New member
This is my first night with my fish. I realize that I am probably just freaking out over nothing, but I know that fish "sleep" and I figured that that is what he is doing, but when i tapped the glass numerous times to make sure, he doesn't move. Is that normal? Is he just a "heavy sleeper" because usually defense instincts would come in and he would want to jolt away. But instead, he is just sitting and not moving on come rocks at the bottom of the tank. Thanks for the help.
 
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