I’m replying to this and earlier post re: having the dog sit quietly with your daughter while she studies.
Like other posters agree dogs vary in sleeping habits. Sleeping with dogs disrupts sleep so doesn’t sound that sensible for your daughter either; particularly as in your earlier thread you indicated that she is about to take exams.
As Villainous points out Dachshunds have back problems, so unless your daughter has a futon it’s not an ideal situation for the dog; also, there's danger of serious injury if your dog falls off the bed. Your idea about putting an extra bed for him in your daughter’s room with a water bowl and giving treats on that bed to make it a desirable area is a good way to go; but it’s something to build up over time. And it sounds as if you want this to happen pre GCSEs.
It sounds from your earlier forum post that your daughter's having pre-exam anxiety and wants the dog around to comfort her? You could make your her room more enticing for short periods: walking him first then treats, kongs, activity/special toys: Nina Ottoson's are good. Personally, I’d second Villainous let the dog follow its normal routine and your daughter could use study breaks to play/walk with the dog with him.
I think everyone would be sympathetic to your daughter’s need for comfort at such a stressful time; but look at it from the dog's point of view. If I were a young active dog sitting still and quiet in a room for hours while your daughter studies, followed by lying still on a small bed would be incredibly boring, bewildering and restrictive. This coming after major disruption in the house from building work.
Have you discussed this with your daughter? She clearly loves the dog or she wouldn’t want to spend so much time with him so would surely want what’s best for him too and as she is an older child, as doing GCSEs suggest, then she is old enough to take this on board.
Also, I’m not sure what type of trainer you used but it sounds as if they were a little out of date. My first dog trainer was a bit like this too. Squirting water is not something that reputable APDT trainers support, it’s aversive and can end up backfiring on you and encouraging the behaviour you’re trying to stop. See for example ‘8 Reasons why you shouldn’t train your dog using a water spray’ on John McGuigan’s blog glasgowdogtrainer.wordpress.com You can find a myriad of similar articles online and elsewhere. Positive rewards-based training focused on helping your dog understand what you want rather than what you don’t is ultimately far more effective. I found this out the hard way! Since it came after the building work sounds like the barking is likely to relate to anxiety, so perhaps you could focus on how to alleviate that instead. We used rewards-based training to teach 'speak' and 'quiet'. Came in very handy when we had months of builders too.