Boyfriend falls asleep everytime when we hang out. What should I do?

My boyfriend and I have been together for nearly 3 years and living together for about a year. Recently, he's developed a habit of falling asleep whenever we spend time together in the evenings, which is starting to frustrate me. During the week, he stays up late, around midnight or 1 am, while I go to bed earlier for work. However, on Fridays or Saturdays when I stay up later, he often falls asleep by 9:30 pm, sometimes even earlier.
We usually go out for dinner, drinks, and a walk before heading home to watch TV, but he almost always falls asleep while we're watching something. He denies falling asleep, even getting annoyed when I mention it, but it happens every weekend. I've even taken videos to prove it, as he denies it ever happened. It's especially frustrating because it makes me feel like he's bored with me, and I could be spending my time elsewhere.
It recently happened on my birthday, which upset me. This has become a recurring issue, leading to arguments, and I don't know how to address it since he refuses to acknowledge it's a problem, even though it keeps happening. what should I do?

Boyfriend falls asleep everytime when we hang out. What should I do?
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