overdosing my antibiotics/Doxycycl

Quick question here.  Im not sure if this is healthy but ive been all over in my timing schedule for taking my medicine.  
I suffer bad insomia so i can never sleep and wake up when i have to take the medicine.
Basically heres my dose.
2 Pills a day
One for every 12 hours.
I aim for 10:30 A.M. and 10.30 P.M.

But heres my problem i either forget or i sleep in too long.

so heres what i do to make up my my dose
EXAMPLE
say i take my medicine at 10:30 P.M. on thursday
then i wake up Friday morning at noon and take my medicine once i wake up
its on and hour or so off then when its later friday night i take it at midnight.
Then my new time to do it is at 12:00 everyday

is that healthy?

[loiloi]

Hi. Taking your antibiotics ten or eleven hours apart instead of twelve will not be detrimental. If you forget a dose take it as soon as you remember, unless it is nearly time for the next dose -in which case skip that dose. Never take two dose together.
Side effects may be increased if you take antibiotics immediately before bed, so avoid this if possible.
Eloise.

[space_ghost]

right, i always make sure to take it after a 12 hours part.
thanks 4 the reply