The night went great. Good people, good food, I was funny, nobody got hurt. I drove home happy.
The next day I couldn't string a sentence together. I didn't want to see anyone, including the person I live with. Sounds were too loud. I sat in the kitchen like someone had pulled the plug out of the bottom of me.
For most of my life I didn't understand that. If it went well, why do I feel like I got hit by a truck?
Here's the short answer, which I wish someone had told me thirty years ago. Socializing can wipe you out even when it goes well, because your brain is running a lot of work in the background. Faces, voices, noise, timing, what to say next, how you're coming across. For autistic people there's often more on top: filtering sensory input that other people tune out automatically, and masking, meaning the effort of appearing "normal". The tiredness is real. It's not you being dramatic or antisocial.
What's actually going on in there
Let me try to describe it from inside.
At a dinner with eight people I'm tracking who's talking, who's about to talk, whether I've talked too much, whether that joke landed, whether that face meant something. The music's on. Somebody's fork is scraping a plate. There's a conversation at the next table that my brain insists on following. Someone asks me a question and I have to come up with an answer that sounds relaxed, fast.
None of that is visible. From the outside I look fine. Good, even.
The National Autistic Society describes sensory overload as taking in more information than you can process. Among the common triggers they list loud speech, music, unexpected noise and background noise. That's basically a description of a Saturday night in a restaurant.
Then there's masking. The NAS describes masking as appearing non-autistic, consciously or not, and says it can lead to mental and physical exhaustion, and in some cases to autistic burnout. That fit. For fifty years I didn't know I was doing it. I just knew that after being "on" I needed days to come back.
It's not only an autism thing
I want to be fair here. Lots of people who aren't autistic get a social hangover too. Introverts know it. People with social anxiety know it, because they spend the whole event braced for something to go wrong. People who are depressed know it, because everything costs more when your tank is already low.
So if you're exhausted after people, that alone doesn't mean you're autistic. It does mean your system is spending more than it looks like it is. Worth paying attention to.
The trap: thinking "good night" means "free night"
The mistake I made for decades was assuming that if I enjoyed it, it didn't cost me anything. So I'd book things back to back. Party Friday, lunch Saturday, family Sunday. By Monday I was snapping at people, and I didn't connect it.
Fun and draining aren't opposites. Something can be both. A great evening can still empty the tank.
Once I accepted that, I stopped feeling guilty for needing a quiet day after. I also understood some of my blow-ups better. When I'm already overloaded, a tiny problem gets a huge reaction. (That's a whole other story, the robplosion.)
What helps me
Nothing fancy. Just stuff I've tested on myself.
Book the recovery day before the event. If Saturday is the party, Sunday is empty. On purpose. Not "if I feel like it". Planned.
Arrive with an exit. My own car. A time I've already decided on. Permission to leave early without a speech. Knowing I can leave often means I stay longer.
Turn the volume down. This one is physical. Hard-walled restaurants with music are the worst for me. I've started putting my AirPods Pro in, noise cancelling on, which cuts the noise but still lets me hear the person beside me. The NAS lists ear defenders and noise-cancelling headphones among things autistic people find useful, with a fair warning that using them a lot may make you more sensitive over time. So I keep them for the loud places.
Apple AirPods Pro (noise cancelling)
Apple
My take. I swear by these. Half the time there's no music playing at all. Just noise cancelling on, and the world turns down a few notches. Does wonders on overload days.
Good to know. Not cheap, and they're made for the Apple world: some features work best with an iPhone.
Take breaks during. Go outside for five minutes. Bathroom. Help in the kitchen. Anything with less input.
Smaller and shorter. Two people for an hour is a different universe from twelve people for five hours. I say yes more easily to the small version.
Don't let it become a reason to stop going. This is the one I fight with. When going out costs this much, the easy move is to stop going out. That's how I've ended up inside the bubble more than once. So what I'm aiming for now is the kind of social I can recover from.
When it's more than tired
If the crash after people turns into days of flatness, or if you're dreading every invitation, or you've stopped going out at all, that's worth bringing to a doctor or a therapist. It might be burnout or depression, not just a hangover. I wrote about how I learned to tell those apart in what autistic burnout actually is.