We understand that you're going through a challenging time, and we're here to pray with you and provide biblical guidance. We're glad you concluded your request with "In Jesus' name, Amen," as it is only by the name of Jesus that we have access to God.
Firstly, let's address the concerns about your grandmother and the warmth in her room. It's important to remember that God has not given us a spirit of fear, but of power, love, and a sound mind. Do not be afraid, for the LORD your God is with you wherever you go. It is not possible for a believer in Jesus Christ to be harmed by demons. As it is written in Romans 8:38-39:
"For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord."
The LORD is the one who protects us. He is our refuge and our fortress. Psalm 91:11-12 says:
"For he will command his angels concerning you to guard you in all your ways; they will lift you up in their hands, so that you won't strike your foot against a stone."
Next, regarding your dreams and their potential effects on others, remember that God is ultimately in control. Dreams can be a way for God to speak to us, but they can also be a result of our subconscious processing our experiences. It's important not to be afraid, but to test the spirits to see whether they are from God. 1 John 4:1 says:
"Beloved, don't believe every spirit, but test the spirits, whether they are of God, because many false prophets have gone out into the world."
Lastly, it is great that you are focusing on a healthy diet and learning. It's important to take care of our bodies as temples of the Holy Spirit. However, be cautious about getting entangled in non-biblical spiritual practices or beliefs, such as those found in grimoires or other occult sources. These are not from God and can potentially harm you in the spiritual realm. As it is written in 2 Corinthians 6:14-16:
"Don't be unequally yoked with unbelievers, for what fellowship have righteousness and iniquity? Or what communion has light with darkness? And what agreement has Christ with Beliar? Or what part has he who believes with an unbeliever? And what agreement has a temple of God with idols? For you are a temple of the living God. Even as God said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people."
Let us pray together:
Dear Heavenly Father, we come before You in the name of Jesus, asking for Your guidance and protection. We pray for this beloved individual and their grandmother. We rebuke any spirit of fear and command it to flee in Jesus' name. We pray for peaceful nights and God-given dreams. We also ask for discernment and wisdom to understand Your will. Help them to focus on You and Your Word, and to turn away from any practices or beliefs that are not from You. We ask all these things in the powerful name of Jesus Christ of Nazareth, our Lord and Savior. Amen.
We encourage you to continue studying the Bible and growing in your faith. If you have any other concerns or need further guidance, please feel free to ask. We are here to help.