The whole point of electrified freight is that it should largely be able to keep within passenger schedules. The transpennine route isn't 125mph railway and nothing runs non stop. Running diesel freight overnight just adds noise pollution to the atmospheric pollution, as well as getting in the way of engineering possessions. Finally, you have perhaps a 4-5 hour window in the night when there aren't many passenger trains running on the network, which isn't long enough to do a bunch of the flows. Are you suggesting they get partway through the journey and then sit around in a loop waiting for the next night?
Indeed and as has been pointed out by the industry, the M62 is busy enough as it is which is why they wanted to expand the rail freight part of the industry not to mention this Government has set goals to become more eco-friendly which seems like lip service more and more.
But electrified freight or not, it meant to keep within passenger schedules which is why you have freight in daytime heading up and down the Hertford Loop as a example or even up and down the Northampton Loop as another example.
As to the TransPennine routes, they go nowhere near 125mph and of course as
@takno has stated nothing runs non stop unless you count the various semi fast services.
You also have the issue of overnight engineering possessions which 1. Is certainly not long enough for the amount of freight that is intended to move by rail but also more importantly means much needed maintenance simply won't get done as there won't be enough time to do it - Hatfield or Potters Bar anyone?
As to freight doing half their journey overnight then just sitting around all day in some loop/siding/yard, obvious someone has forgotten that some rail freight is time critical so can't just sit around in the middle of nowhere waiting for nightfall plus you have the driver hours to think of.
Shall we suggest that the road transport lobby tell its members that they are not to clog our roads in the day with their HGVs and only transport freight at night? As that is more or less what is being suggested, that would get laughed out in seconds!
As to freight electrification until such a time comes that more services CAN be electrically hauled then we should be doing everything possible to increase rail haulage within reason of course most importantly using the Victorian infrastructure to the best that it can cope with.