Lantus unfortunately (if it is injected once daily at bedtime) can and will give ok bg levels upon rising in the morning (presuming that he dose used is seeing you through the night) but without any bolus for food at breakfast (because nothing will be eaten), will later cause bg levels to rise somewhat which then leaves people to question just how active Lantus really is. The easier way therefore to deal with DP that comes after rising in the morning is not to lay in bed, get up, give yourself some bolus, eat some grub and then go back to bed for that lay in.