void PCB::sleep(Time timeToSleep)
{
	if(timeToSleep>0){
	PCB::running->state=Blocked;
	Sleep *s=new Sleep(PCB::running,timeToSleep);
	Sleep *temp=sleepHead, *old=0;
	while ((temp!=0)&&(s->time>=temp->time))
	{
		s->time-=temp->time;
		old=temp;
		temp=temp->next;
	}
	if ((sleepHead!=0) && (temp!=0) && (old!=0))
	{
		old->next=s;
		s->next=temp;
		temp->time-=s->time;
	}
	else if(sleepHead==0)
	{
		sleepHead=s;
	}
	else if(temp==0)
	{
		old->next=s;
	}
	else if(old==0)
	{
		temp->time-=s->time;
		s->next=sleepHead;
		sleepHead=s;
	}
	Timer::requested=1;
	}
}