trying to manipulate dreams (like doing lucid dreaming) is not just an amusement, it's messing around spiritually where it's illegal to do so, according to the Bible (falls under the ban on witchcraft and spiritism (communicating with spirits, which i suspect tulpas fall into as well))
As a kid i thought it would be cool to lucid dream and i pulled it off (among trying other things attempted like doing spells), and then i suffered disturbing sexual nightmares for years to the point i would just feel so disturbed i was scarred, and tried to force myself to ignore them when waking up.
later i got into lucid dreaming hardcore and it went from silly fun to actually literal witchcraft and spiritism, trying to change irl things and trying to receive prophecy or to communicate. when i realized this was sin, i tried to back out and stop, but then it got extremely dark for a while. I continued to refuse to participate in dreams but was forced to experience the dreams still, like forced to be lucid and to almost act, when i didn't want to. Forced to think the dreams were escalating to the point where maybe the occult was going to get me, silly things like that. it was illusion but it had the appearance of being real, and acting in fear seemed to make things worse.
I prayed over a period of time, asking Jesus to protect me from the unwanted sexual dreams and the lucid dreams, and it got to the point now where I'm not experiencing lucidity or forced to participate in sex in dreams anymore.
Saying this as a warning, attempting to manipulate dreams is the verge of witchcraft, people might argue if its technically a sin or not, but it's something we don't normally have access to, and it leads to more extreme sin of direct witchcraft and spiritism (communication with spirits). it's not something cool that you're in control of like it feels at first.
it is possible to get free from it. Jesus said don't lose heart; pray asking God the Father every day and He will act soon (Luke 18:1-8)
In general with sin, Jesus said we must repent and believe in Him or we will die in our sin. Whoever believes in Him will live even if they die.