My husband and I both find these tablets very helpful. When my sleep pattern has been disturbed or got out of sync and I'm finding it very hard to get to sleep or stay asleep, these really help to re-set me and get back into a good rhythm again. I take them for a couple of weeks or so, and then I tend to find they aren't helping anymore and so I stop taking them and sleep well with out them. Then when I'm out of sync again, I take them again. Very good to help you re-set.