A brain expert has highlighted the "fine balance" required to reap coffee's "brain benefits" without impacting sleep - and has even shared the specific time she stops drinking it every day. A common dilemma for coffee lovers everywhere is knowing when to stop drinking caffeine to ensure that it doesn't affect sleep isn't always obvious, but Dr Faye Begeti could have the answer. As a neurology doctor and neuroscientist at Oxford University Hospitals , Dr Begeti knows a thing or two about the way