If, for instance, you're somebody who falls asleep just fine but wakes up in the middle of the night... and has trouble falling back asleep, there are two categories of supplements that you might want to consider. The first is myo-inositol, typically taken as 900mg of myo-inositol. Myo-inositol can help shorten the amount of time that it takes to fall back asleep if you wake up in the middle of the night.