Did you forget your fan?
I have slept with a fan since I was a baby, and I find it hard to sleep without the comforting sound it makes. However sometimes when I travel I can’t bring a giant box fan with me and then I end up searching for a fan noise online to buy and then play on my laptop so I can sleep. I just discovered SimplyNoise.com, and I love it. It’s super-simple, and lets you generate white, red, or pink noise. I find red noise to be the best, but YMMV. Neat.