The last few days, I've been hearing what sounds like Chinese (or a variant) on 7250 and 7300. It's definitely broadcast stations and not Chinese-speaking hams. It only fades in after 0100 UTC and is gone by 0300. I know that the signal path to East Asia is mostly in daylight at those times, so it's rather surprising. What isn't surprising is that the Chinese would plunk broadcast stations down on the ham bands, although in Asia hams can only use up to 7200 khz so it's acceptable as far as ITU rules go. I know that the US uses 7300-7500 for supposedly "private" religious stn's. Any idea what stations these are? I suppose they're CNR (Chinese domestic network) stations.
The Chinese use numerous frequencies on the 41 meter band for domestic and some regional broadcasts. During early morning on the West Coast the 41 meter band (from 7200-7400 or so) is usually covered with Chinese stations, many of them CNR1 or other CNR stations.
Like you mentioned, you may have heard the 41 meter band under the equivalent of grey line or sunset skip conditions. It usually stays in until several hours after daylight here on the West Coast.