I'm taking a 20 hour flight next Monday, just me and DS (yes, I'm mad) and was wondering if its ok to take those herbal sleeping tablets? Obviously Nytol is out of the question but I was thinking about the tablets with Valerian etc. I tend to be a slightly anxious flyer (especially if there's turbulence) and in the past I've taken those tablets and though I've not necessarily slept every time they have definitely helped me to keep calm.