PF (CAPT) OVER ROTATED ON TKOF. FLC WAS SURPRISED BY APPARENT AFT CTR OF GRAVITY AND BOTH FORGOT TO RAISE THE GEAR AFTER TKOF. TWR CTLR BROUGHT IT TO THEIR ATTN. RPTR FO ATTRIBUTES FATIGUE AND DIFFICULT SCHEDULING AS CONTRIBUTING TO THEIR DETERIORATED AWARENESS.

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THE DAY OF THIS EVENT OCCURRED AFTER A 'REDUCED' REST OVERNIGHT (IE; LESS THAN 8 HRS REST). LEG 3 AFTER RPTING FOR DUTY AT XA15 AND CONTINUING TILL XI50 WITH 5 LEGS TO DO AFTER THE 'REDUCED' REST. I HAD NOT SLEPT WELL AT ALL AND I WAS FEELING VERY TIRED AND SHORT ON MEMORY. THE CAPT WAS FLYING AND WE WERE VERY HVY WITH A VERY AFT CTR OF GRAVITY. THE CAPT 'OVER-ROTATED' THE ACFT AND WE WERE BOTH SURPRISED AND TAKEN BY THE PITCH UP WE EXPERIENCED. THE CAPT THEN; DUE TO THE OVER ROTATION; FORGOT TO CALL 'POSITIVE RATE; GEAR UP.' I FORGOT TO BACK HIM UP AND WERE INFORMED BY SEA TWR THAT OUR GEAR 'APPEARED TO BE STILL DOWN' UPON CLRNC TO CHANGE TO DEP CTL. WE THEN SELECTED GEAR UP AND CHANGED TO DEP WITH NO FURTHER INCIDENTS. I JUST REMEMBER FEELING A BIT FRAZZLED FROM A QUICK TKOF CLRNC FROM THE TWR (TYPICAL REGIONAL AIRLINE HANDLING AT LARGE ARPTS TO SQUEEZE TURBOPROPS BTWN HVY JETS). I FELT VERY BURNED OUT; TIRED; AND WORN OUT FROM LACK OF REST AND MULTIPLE LEGS SINCE AN XB00 LCL TIME FIRST FLT. THIS EVENT OCCURRED AT ABOUT XF30 LCL TIME. ALSO; A LACK OF THE GND CREW SUPPORT. WE WERE BOTH AMAZED AT THE AFT CTR OF GRAVITY. SURE; WE DID THE WT AND BAL; BUT THE CAPT NEVER LET ME KNOW EXACTLY HOW TAIL HVY WE WERE. (I; AS FO; SET THE TRIM FOR TKOF.) WE WERE SO BUSY AT RAMP WE NEVER HAD TIME TO JOINTLY DISCUSS THE CAPT'S COMPLETED WT AND BAL MANIFEST. ANOTHER EXAMPLE AT HOW MUCH WORK IS DELEGATED TO THE ALREADY TOO BUSY PLTS OF A REGIONAL AIRLINE. LOAD CTL FROM DISPATCH WOULD HELP!