In our house it seems that four-year-olds always want to come into our bed in the middle of the night. And, since there always seems to be a four-year-old around, that makes for many interrupted nights of sleep. I really love sleep. Haven't gotten much in the past 14 years, so I treasure all the shut-eye I can get!
Since Bryan and I have a queen-sized bed, putting a third party in with us makes things uncomfortably cozy. And those smart little children have figured out that if they go to Dad's side, he'll just scooch over onto my side and keep on snoozing. Meanwhile, I cling to the edge of the bed and dream of falling off skyscrapers.
Our solution is "The Floor Bed." Basically it's a folded quilt on the floor with a pillow and blanket. We explain to the current-four-year-old that if they need to be close to Mommy and Daddy, they can come into our room and crawl in their floor bed to sleep for the rest of the night. Without waking us up! If they get in bed with us, we will take them back to their own bed.
Often I wake up to see a little angel sleeping beside my bed. This might seem indulgent to some, but having experienced 5 previous four-year-old plus the current four-year-old, I know that this phase will pass. The Floor Bed helps it pass with less stress for all.