Correct in a very technical way !
There are approximately 18 slots available after 23.01 and 06.00 every night .
Almost all were at one time used by freighters but these days are repurposed to long haul arrivals.
Depending on season the earliest arrival are 04.40 from Boston or 04.50 from Hong Kong !
What is in force is very strict slot control and noise abatement procedures.
That said when there are advantagous winds over the atlantic early arrivals are held in the air until after 06.00 .
Between 06.00 and 07.00 the runways are used in mixed mode with near parallel lands as well.