I have a similar situation Cidu, except with co-workers as well. Now, when I see my brother in a dream I'm usually talking about LDs, and something just 'clicks'. As for work, what I started doing is preforming reality checks as I approach the front desk by looking at text on the wall multiple times. When I see certain co-workers, especially when it's the first time in the day, I either ramp up awareness as much as possible and question the reality. or, if I clock is nearby, I'll check it ~4 times (I like to be thorough). If I can get away with it it, I'll check hands or do a noseplug.

I'll also add that my dog has been a dream sign for a bit, so I literally ask her before bed to let me know if I'm dreaming (it's a funny conversation). Well.. it actually worked 2 days ago lmao.