Yes of course- or else once train crosses Arakkonam we will be like our station is next and completely lose sleep- I actually oppose even Cantt boarding because that mins of time also you can sleep rather than waiting at Cantt
theres no issue of TTe waking up- its about your sleep
I also hit the berth immediately on boarding - before the train starts at around 22-10 itself; but be watchful for your luggage. Sleep hard when the train starts. There might be some disturbance at BNC for addl boarding, if any berths are vacant in you bay. Better to set alarm for getting down at PER at around 03-50.
This train normally trails Kerala exp from JTJ upto KPD. Sometimes, this mail is detained till in JTJ till Kerala exp departure.