Whilst in the UK I picked up a homeopathic sleeping "aid" that is outrageously strong - Nytol. Last night I took a couple about 30 minutes before going to bed. Twenty minutes later it was like I was hit by a ton of bricks. It actually impacted my ability to take in a full breath. Previous times I used it I was already laying in bed relaxing. This was the first time I was still moving around - doing homework and reading grant applications. Really stimulating stuff.
Images from Nytol website.