Sorry, I can't give you one. This effect is extremely variable among individuals. You'll have to experiment on yourself and find out what works for you.
The good news is, for those who do experience this the effect is usually consistent and predictable. So once you do find something that works you can expect it to keep working.
This FAQ is mainly intended to reassure you that if you do experience this effect, what you experience can be explained. Many doctors, CDEs, RNs, and so forth will tell you this doesn't happen at all. They are wrong. You may need to teach them about it.