What's up with "3 a.m."?

I got the whole idea of "3 a.m." after watching The Exorcism of Emily Rose. So, I did my homework about it and here's what I found!

Let's start from the movie itself! The whole "3 a.m." started with Emily noticing a strange burning smell coming from the hallway at 3 a.m. and when she checks on it, she sees the door open and shut by itself several times. When she goes back to her room, she sees a jar of pencils and pens move by itself. Additionally, her bedclothes roll themselves down and a great weight seems to press down on her, a force which also proceeds to choke her. Through these episodes, she wonders if they are really happening or if they are just hallucinations. She suffers more visions, is hospitalized, and diagnosed with epilepsy. She is given anti-seizure medications which she claims do not work. Her visions continue, as do her severe bodily contortions.

Later, she leaves school and returns to live with her parents. She and her parents become convinced is possessed by demons. They ask for their local parish priest to be called in to perform an exorcism, and the Church agrees. The prosecution argues that all this could be explained by a combination of epilepsy (the contortions) and psychosis (the visions).

As the trial proceeds, Erin Bruner begins to experience strange occurrences in her apartment at 3:00 AM, including strange smells and sounds. Moore warns her that she may be targeted by demons for possibly exposing them. Later in the film, he explains that 3:00 AM is the "devil's hour," which evil spirits use to mock the Holy Trinity. Significantly, it is the opposite of 3:00 PM, traditionally taken to be the hour at which Jesus died.

This is where we get the whole idea about "3 a.m.". Its the "devil's hour", the opposite of 3 p.m. which is the hour Jesus died.

Reading about this "3a.m." phenomena, I came across plenty of question from users across the world of separate forums, all searching for a reason why they are abruptly awaken at 3 a.m. and couldn't go to sleep after that. Personally, I've experienced that incident a few times and I couldn't be bothered about it till I read about this. However, I came across a logical answer (which I feel logical) from this website.

It states

Libby from Thoughts…usually with attitude… made a mention of how she often wakes up at 3:15 am. How many of you wake up during that 3 am hour? I know people who wake up during that hour and can’t go back to sleep, no matter what they do. I find, more often than not it’s that magical 3 am time when I note the blurry red lights on the clock during the night.

It’s been suggested that this is the time of extreme early morning when more firefighters and police are called. That’s true, but then it takes a whole night of drinking to get into trouble at 3 am. It’s also believed that we might be having access to our God figure in that state of mind in deep theta sleep and in between REM sleep. Others think that it’s the extreme darkness that occurs just before dawn that permits melatonin to adjust and create a sleep state that’s in the process of shifting, a time in which we could awaken. It’s also entirely possible that discomfort after hours in our beds is what jostles us awake at about that magical time (especially middle-agers). Whatever the reasoning, any time you’re under extreme stress, you’re likely to wake right around that 3 am hour and not be able to fall back asleep again. Obviously, our bodies are telling us that some sort of stimuli (earthly or unearthly) is creating a dark-of-night awakening.

This 3 a.m. phenomena is based on how we take it.. =) I prefer sticking to the "witching hour"!