This song was all over mainstream radio a few years back when I was going to the gym. I remember a weird, almost hypnotic fascination with this song back then that I found kind of creepy, especially because I'm not into this kind of music normally. I remember thinking that this must be part of the "programming" going on in mainstream radio. Never really understood the lyrics but since I thought about this the other day, I looked it up and understanding the lyrics makes it even creepier. Some say it's about an alien abduction experience, some say it's about child abuse, or just depression... Still has some kind of hypnotic effect on me that I feel the need to consciously guard against, strangely.
...the song was inspired by Goulding's childhood fear of the dark.
[...]
Lyrically, the song discusses the fear of the dark that Goulding had as a child, and how she could only sleep with the lights on. In an interview with 97.1 AMP Radio in late July 2012, Goulding stated, "Sometimes if I've had a couple of drinks and I come back and just like lie on my bed and fall asleep I wake up and realize that there isn't a light on and I have to turn a light on."[14] She also explained, "It can be seen as something like a lighthouse that kind of always guides you home. I've always felt comfort sleeping with the light on, and I've always felt comfort being with my siblings."