Not the strongest, but this is what I use. Take 4-6.
Natural Factors Tranquil Sleep. I bring these on backpacking trips and business trips too. https://www.amazon.com/Natural-Factors-Stress-Relax-Tranquil-Softgels/dp/B002REGWTA/ref=sr_1_17_a_it?ie=UTF8&qid=1496072603&sr=8-17&keywords=sleep%2Btablets%2Bnatural&th=1
I also always bring earplugs. These: https://www.amazon.com/Howard-Leight-Visibility-Disposable-LL-1/dp/B00IT5MHWW/ref=sr_1_11?ie=UTF8&qid=1496072707&sr=8-11&keywords=earplugs&th=1