Don't know the exact reason but if I'm alone I see some dark shadows passing through infront of me... can anyone explain what problem I'm facing?

If I see it again there will be nothing... and one fine day I'm so sleepy tn I went to sleep... after 5minutes of my sleep... I really felt someone is walking on my stomach (like it was a feet... passing on my stomach)... and the same thing one other day happened... Likewise I felt sleepy and I slept after 5minutes of my sleep.. I got a dream that a different shaped dark shadow searching for something in my kitchen? and all this happens only if I'm alone in my home
Don't know the exact reason but if I'm alone I see some dark shadows passing through infront of me... can anyone explain what problem I'm facing?
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