Our best suggestion is to try loosening the screws a quarter turn. Over-tightened screws are the most common cause of wood creaking.
You can find an instructional video at this link that explains the process: https://www.youtube.com/watch?v=cz8SCKTh0wc
If loosening the slats doesn't stop the creaking sounds, you can try placing small felt coins under the slats. Follow the steps below:
1. Remove the mattress to access the slats.
2. Remove the slats using a 4/5 mm Allen key.
3. Place small felt coins on each side of the screw hole.
4. Reinstall the slats using a 4/5 mm Allen key.
5. Try using some silicone spray near the areas where wood meets wood. this might mean that you will have to disable the bed / Sofabed, but this will help correct the noise that you hear.