Liver dump or dawn phenomenon happens to most people every morning.
As our bodies prepare themselves for the day, ahead our livers dump some glucose into our blood to give use the energy to get up and start moving. For those without diabetes, their pancreas reacts to this and releases insulin to convert that extra glucose into energy.
For those us with broken pancreas, it is much harder to release insulin to handle this rise before we wake.
If you are on a basal bolus injection regime, there are some techniques such as splitting your basal or just taking a correction bolus dose to bring down your BG.
One of the great advantages of an insulin pump is that you can adjust the basal rates throughout the day and plan for the dump by having an increased basal dose coinciding with it.
There are many many threads about "dawn phenomenon" on the forum.