Kb3 reduces sleep time drastically.
How many hours do you usually sleep? And how many hours are you sleeping now after KB3?
Do one more cycle of KB2 and then come back to KB3 is the easy fix.
You can do a practise called microcosmic orbit to regulate the energy if you are into energetic development.
Or just Make sure you spend the energy completely either in a very difficult task Or focus intensive work.
When I was on KB3, I made it a point to use up all my energy one way or the other, either in physical work or mental work, so that I can fall asleep.
I also slept in a slightly cooler room because of the increased heat from the body.
Even after all this, I only slept for Four or five hours, Instead of the usual eight hours for a whole cycle.
I was physically fine, But mentally it was too much change too quickly. Like years of sleeping for eight hours suddenly got changed to only four or five hours. I felt like a different person and I just dropped KB3 and went to kb4 after that.
Now that I think about it, I should restart my KB cycle soon