have you heard some strange sound at midnight after you wake up in bed

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some one say,iam a light sleeper, i can easily wake up when i sleep and i have dreamed a lot. some time,when i wake up unreasonable at the midnight, i could hear some sound from above, such as glass ball dropping onto the floor,or someone moving furniture . at the very begginning,i was scared about that, but finally i found our above neighbour was playing majong then,so the majong drop down and the sound came. but except those sound,some other sounds still accur,and strange too. have you ever experience the strange sound you heard at the midnight ? do you think they are natural?or sth abnormal?