Ping spikes after 02h30 GMT+1 Why is this happening?

I noticed that every night, the ping spikes around this hour for some weird reason. I usually play with around 150 ms on PBE which is fine for me, but after 02h30 it's stuck at 220 ms. I checked and everything else is working fine, I am from Euw and the ping is normal as usual but not here after the mentioned hour.
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