Some people believe that you are extremely suggestive while you sleep... at least during the state of dreaming; which is in deep alpha and Theta I think.
It has at least been proven to be a connection between being in the Alpha state (I'm talking brainwaves here)
and suggestibility, some claim that you are as much as 25 times as suggestible, but that's probably pretty exaggerated.
Drunk people are already hypnotized, so it can be difficult to compete with the reduced state they are already in.
and embedded commands, depending on the person, I'd say they can last for a while, like when <i>you want to call me</i> I can be reached at 1234567 or something like that.
But generally They are more directed for immediate response.
e.g. how you may find that Your Mine(the d is mute so it sounds like mine) sometimes just want to Sleep Now, but your body may try to stay awake just a little longer. Until it finally just Decide to Let Go, and Drift into that pleasant Relaxed state where all your worries just melt away....
You may Feel the Desire when you are faced with a New Direction (Nude erection...) to Just Reach out and grab it.... Grabbing hold of ha-penis and Feeling so Good. Wanting to feel ha-penis deep inside. The warm glow of it penetrating you and allowing you to really Feel Good.
And so on.
In churches it's more the rhythm of the songs and preaching that gets you into a receptive state (remember what I said about the Alpha waves earlier.) which then is suited to make you accept "savior" or whatever they sell.
Some churches even have different kinds of candles, incense and even in some cases a priest who stands behind the mass chanting in a slow rhythm (45-60 bpm) to aid people into the relaxed trance-like state, where they are more susceptible to the Preacher's words about savior and damnation, sin and suchlike.
In effect Masses can be very much like a hypnotic trance.
Some people you may see have foggy eyes, slowed breathing, relaxed facial muscles, they may be slowly swaying from side to side, some even stop swallowing. Depending on the efficiency and ability of the particular church you may find more of the common signs of being in a Trance.
But I'll not go deeper into that.
I think the Pastors may have had some passion and maybe a little guidance, but the part about being boring is not really an efficient way to go.
It is then better to initiate the imagination of the subject(s) and let them dream into the desired state. You have a far firmer grip on the person if their imagination is led by your voice, and not away from it.