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7. Night Recorder
Most mischiefs happen at night, and for the most part, you are not awake to be aware of it. Studies have shown that cheating partner has a fixed time at night when they know you are in your deepest slumber and they use that time to connect with the people they are seeing. Night Recorders are usually used to keep track of sleeping patterns and stuff related to sleeping. But it can also be used to see if your partner is getting up a particular time every night. If s/he does, then the next step is to find out what s/he does.