We can wake ourselves up by increasing our oxygen level by breathing deeply. Or conversely, we can put ourselves to sleep with a kind of meditation of shallow breathing, and repeating silently the words to the rhythmic "in" and "out" like a mantra.
We can't force someone to forgive. Therefore, the road to forgiveness may also involve understanding the person who has harmed us. This requires starting off on a journey that may entail a close examination of the person we need to forgive. The journey can be long and torturous.