I don't have a problem with coffee and sleep but to be honest I try not to drink coffee at night. However, stopping by my favorite coffee shop at night is a great excuse for a night coffee, hehe. Maybe you could try drinking it lighter at night or adding milk.

Sometimes I think it is also a preconception that if we drink it in the evening, coffee makes it difficult for us to sleep ;) Caffeine can aggravate falling asleep if we are under stress or have a disorder that makes it difficult for us to sleep. But a cup of coffee if we are relaxed and having a good time, should not make a difference, I think.