The DIY works for me, I use a vax 2000 wet & dry hoover on the mattress and then use a spray, works a treat, those buggers love my bottom
Just like a new born baby
I get the maid to do it every 3 months, though you have to show them how to do it correctly. May need doing monthly or even every 2 weeks if its bad but it is easy.
The are only in the centre of the bed at first light for their vampire activities when the body gets quite hot and humid, then feed and run, hide in the edges of the mattress, all the way around. Some fall from the ceiling too! So the room needs a very good going over! Only happens occasionally now.
I see a great deal of people in Singapore with bed bug bites, some are very sever, I guess they do not know about them, young children are covered in bites on their legs, its really bad.