I Am A Recent Below The Knee Amputation Victim Resulting

I am a recent below the knee amputation victim resulting from an accident. My dr. Has prescribed me 7.5/325 oxycodon for pain along with gabbipintin 300 msg 3 times a day. My pain seems to peak around six pm daily. I only take the oxycodon at bed time. Most nights I lie awake until 3 or 4. Can I safely take 1 o two mor oxycodon at bedtime so my pain does not keep me awake?
YYYY@YYYY