More than once I have noticed my male boss stopping in the hallway and staring at me for 30 seconds to a minute before going back into his office. He does it very subtly and when I'm not looking directly at him. I see it out of the corner of my eye. I sometimes think he does it to see what I'm working on, to check up on me, or maybe it's just out of habit. But I'm a good employee and he trusts me with additional projects so I don't see a reason for him to be checking on my work. Is this normal for a boss to do? Just wondering. It makes me feel self-conscious.