Here's some notes from the ESV Study Bible.
No immaterial soul. Jehovah's Witnesses do not believe that humans have an immaterial nature. The “soul” is simply the life-force within a person. At death, that life-force leaves the body. Biblically, however, the word “soul” is multifaceted. One key meaning of the term is man's immaterial self that consciously survives death (Gen. 35:18; Rev. 6:9–10). Unbelievers are in conscious woe (Matt. 13:42; 25:41, 46;Luke 16:22–24; Rev. 14:11) while believers are in conscious bliss in heaven (1 Cor. 2:9; 2 Cor. 5:6–8; Phil. 1:21–23; Rev. 7:17; 21:4).
Hell. Jehovah's Witnesses believe hell is not a place of eternal suffering but is rather the common grave of humankind. The wicked are annihilated—snuffed out of conscious existence forever. Biblically, however, hell is a real place of conscious, eternal suffering (Matt. 5:22; 25:41, 46; Jude 7; Rev. 14:11; 20:10, 14).
These directly refute the notion of soul sleep
Luke 20:37-39 (New International Version)
37 But in the account of the burning bush, even Moses showed that the dead rise, for he calls the Lord ‘the God of Abraham, and the God of Isaac, and the God of Jacob.’ 38He is not the God of the dead, but of the living, for to him all are alive.”
39 Some of the teachers of the law responded, “Well said, teacher!”
Matthew 17:1-3 (New International Version)
1 After six days Jesus took with him Peter, James and John the brother of James, and led them up a high mountain by themselves. 2 There he was transfigured before them. His face shone like the sun, and his clothes became as white as the light. 3 Just then there appeared before them Moses and Elijah, talking with Jesus.
2 Kings 2:11 (New International Version)
11 As they were walking along and talking together, suddenly a chariot of fire and horses of fire appeared and separated the two of them, and Elijah went up to heaven in a whirlwind.
Hebrews 11:4-5 (New International Version)
4 By faith Abel brought God a better offering than Cain did. By faith he was commended as righteous, when God spoke well of his offerings. And by faith Abel still speaks, even though he is dead.
5 By faith Enoch was taken from this life, so that he did not experience death: “He could not be found, because God had taken him away.” For before he was taken, he was commended as one who pleased God.
Hebrews 12:1 (New International Version)
1 Therefore, since we are surrounded by such a great cloud of witnesses, let us throw off everything that hinders and the sin that so easily entangles. And let us run with perseverance the race marked out for us
Blessings in Christ,