expensive? thats dirt cheap if you are buying real, pure 677... you can go buy some cut bull shit if you want elsewhere and see the difference because its night and day... its counterfeited everywhere because of the extreme cost it actually takes to produce it... some like it right before bed and some like it first thing in the morning... if it does not effect your sleep negatively, which it should not, then pre bed is the best... it should be enhancing your sleep...