A nice sleep is NOT one that leaves you feeling
A nice sleep happens when you go to bed at peace and wake up refreshed some hours later.
A nice sleep will not happen if:
You go to bed in a dispute or are angry/anxious in any way.
You have had too much caffeine the previous day.
You are hungry/in pain/uncomfortable for any reason.
Noise and light have different effects on different people.
Some people find nice sleeps more difficult than others but you should have lots before PBP...