Researchers out of the University of Pittsburgh conducted a study that found that when wives have trouble falling asleep, the quality of their relationship with their husband suffers. Meaning, both the husband and wife were reported feeling ignored or criticized the following day. Conversely, the opposite is not true when men had trouble drifting off. For the study, researchers monitored the sleep quality of 35 married couples for 10 nights. (None of the participants had been diagnosed with a sleep disorder or other serious medical problems.) They measured the amount of time it took each to fall asleep, looked at their total sleep time and the number of times they woke up during the night. The couples were then asked to fill out a questionnaire the following day. There are various theories as to why the two genders react this way, but it's something you should think about when you're keeping each other awake at night.