My cocktail makes snishing sounds?

it makes snishing sounds and he bits his lower beek with the upper one a alot.Is he sick?|||When he bites his lower beak, is he grinding it, my African Grey does this when he is sleepy and content, experts cannot find a reason for this, they seem to do it simply because they want to.|||Hookbill bird beaks grow continuously -- he is grinding it down -- which is normal so that it will retain the shape he desires.|||Hissing or snishing? haha...your feathered one is probablt resting %26amp; simply telling you to leave it alone...this is natural for feathered ones...Grinding the beak also signifies contentment %26amp; readying for rest_time...Simply leave your bird alone during such times. It is natural behavior~|||it's normal my cockiteils do this in the evening at bed time|||Means he is sleepy and content.. look closer you can sometimes see them yawn or even struggle to keep their eyes open