1) Your Sleep.
One problem with bedtime TV watching is simply the temptation to stay up late to find out what happens next. The biggest problem is that the bright light that your TV screen emits may actually keep you up. Your body clock is set according to the rise and fall of the sun. In the evening, you start to produce a hormone called melatonin that gradually makes you feel sleepy. It continues to increase over the course of the night, helping you to fall asleep and stay asleep until morning. But it dissipates in the wee hours, and is ultimately snuffed out by dawn’s light.
Enter: artificial lights. The increasing use of screens, including televisions, computers, tablets, and smartphones is especially problematic for sleep. That’s because electronics emit a particular type of blue light that is capable of triggering the brain to stop making melatonin.
2) Your Stress.
Experts believe that television excites the mind in a way that creates more anxiety. It's not entirely clear if this is true, but it does seem possible, since television excites neurons in the brain and excited neurons do appear to create more anxiety. But it's not clear how or why, and whether or not programming or other experiences in life at the time matter.
People also tend to almost always watch stressful programming, and stress is stress. It's not just horror movies - reality TV shows, dramas, thrillers, even documentaries can be stressful in many ways. When you have anxiety, you need as many positive emotions as you can. Very rarely do any of those types of shows cause positive emotions, and that can be a problem.
3) Your Sex.
A study by a sexologist has found that couples who have a TV set in their bedroom have sex half as often as those who don't. "If there's no television in the bedroom, the frequency (of sexual intercourse) doubles," said Serenella Salomoni whose team of psychologists questioned 523 couples to see what effect television had on their sex lives. On average, couples who live without TV in the bedroom have sex twice a week, or eight times a month. This drops to an average of four times a month for those with a TV, the study found. For the over-50s the effect is even more marked, with the average of seven couplings a month falling to just 1.5 times.
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