Maybe it is a "night time" thing.
I know the best way to find out if it is my internet provider is to call them but I usually feel my blood pressure rising when I have to talk to them about anything

so I just try to ride it out and hope it goes away soon.
Thanks Jenny!
1) Take a high blood pressure pill and 2)Take the advice of the Wise Moderators and CALL your Provider 3)I had this Nighttime problem and after calling and insisting that something be done, they finally changed the *wires on the telephone polls and all has been working A1 for the past 2 years even during heavy storms.
So put pressure on your Provider and if you have to threaten to change providers, Do So, and I would imagine that you living in Chicago you Must have choices of providers, unless of course you are living is a Rural area of Chicago where there is little competition.
All said and done, Do Not Put up with this, you don't deserve that and you should have better service.
Good luck in resolving your problem.
*Note: This is a problem I was having at my cottage with a DSL provider.