You could dig into with traceroute.
Usually "Cyberdays" put some strain on infrastructure globally - heightened traffic levels.
You can also check your isp here (among others):
You can also check your isp here (among others):
It seems like, as you said, there was a request spike Sunday on the whole internet (including the AS of my ISP), but Cloudflare's estimated latency for that day doesn't show a significant spike.