I suffer from a disability (Chronic Fatigue Syndrome, also known as myalgic encephalomyelitis or ME). Basically I am constantly tired, and am actually more productive if I do fewer hours. Sometimes I need to stop working and rest for a while, or decline certain tasks. I'm mainly a software developer but sometimes have to decline or use power tools to do simple things like taking a few screws out to access a debug port.
When applying for a new job is there a way I can sound out any potential employer without ruining my chances of getting the job? Although discrimination on these grounds is illegal, practically if you go in to an interview and ask how they feel about you taking a couple of short naps during the work day you are unlikely to be made an offer, or may get a reduced one.
To be clear, I am reasonably productive and IMHO worth a full salary, and the law seems to agree with me here (correct me if I'm wrong, but paying disabled employees less for equivalent work is not allowed).
Should I perhaps bring it up after being made an offer? Would employers feel that is dishonest perhaps?
The question is UK based.