Two Worlds: I Travel Between Them in My Sleep and Cultivate Immortality with an AK

Every seven days on Blue Star, whenever Wang Chen falls asleep, he is forcibly transmigrated to another world, where time on Blue Star stops.

Every seven days in the other world, whenever Wang Chen falls asleep, he is forcibly transmigrated to Blue Star, where time in the other world stops.

If Wang Chen dies in the other world, he is forcibly sent back to Blue Star and wakes up there. Seven days later, when he falls asleep again, he is forcibly transmigrated to the other world, but the time he returns to is one hour earlier.

Anything on his person or in his arms can come along when he transmigrates.

In short: Falling asleep triggers travel between the two worlds, with a seven-day cooldown. He can take objects from either world with him.