I want to find out if someone died in my home. My daughter is 30 months old and she doesn't sleep at night. I've caught her multiple times talking to someone. I'll ask her who's she's talking to and she points up. Last night she slept early, and she didn't wake up. My mom said that a man kept comeing to her mind while she was sleeping, telling her he wants us to go to sleep forever. When my daughter talks at night she argues sometimes. Don't know if it's the man my mom seen and her sleep or if my daughter is in the imaginary friend stage.
I really want to find out what's going on so if anyone can help me with anything it'll be really appreciated! ;)

Move the head of your child's bed to face north,If it continues,there is a unrested spirit attached to the house,but that doesn't mean someone died there. It may be a specter of demonic influence attaché to prior activity to the house. In this case, fast and pray,three days and three nights confessing anything in you life that has been unfair to your family out loud. Demonic presence canot abide confession or the praise of God. Sing spiritual songs to your child before they sleep.

I do not believe ghosts exist, but I do believe in demons, as I have experienced cases like yours.
One of these experiences were strange noises that took away my sleep, what I did and recommend you to do is to read verses in the bible like the Psalms, and praying a lot. After I did those things, I felt at peace and could finally sleep untroubled. Some Psalms I consider good are:
Psalm 4:8
Psalm 91
And Psalm 23
God bless you, and I hope I've been able to help you

I think it is all in your head

It could just be a stage in the child's life. This has occurred in many children around this age and if it keeps occurring, take the child to a doctor to see if there could be any troubles brain wise.