After changing schedules from last year’s format the NA LCS has decided to try starting earlier on Sundays.
The change will come next week (week 5) and should last throughout the end of the 2018 season. The new start time on Sundays will be 11:30 a.m. for NA LCS Countdown and games should start around noon.
According to Riot they’ve made the change due to feedback from the community, but will still be monitoring things to see if it actually helps. If a change needs to be made from here on out it won’t be until they have a good amount of data to base it off of. You can read the full announcement of the time change here.