Sleeping saga

I feel guilty of it, but I can't avoid it. I am talking about sleeping in lecture classes. I am taking a week-long course on CFD. It is really important. But whenever I try hard to be awake and attentive, I feel sleepy. Its not that lectures are very boring, or I am not interested, or I am sleeping less in the night ... I just can't keep my eyes open.

First hours, lecture on Numerical Methods.
Student: Madam, how will we decide which equation to use?
Madam: Depends on the situation and physics of the problem. Am I right?
Student: Is there no guidelines that for this kind of flow, we shall use this kind of equation...
Madam: It depends. OK I'll bring my notes tomorrow and discuss this issue. Am I right?

Post Tea Sessions, lectures on Fluid Mechanics.
Student: But sir, if we take case of ... then can we apply the same formula?
Sir: Oh, yes. Since this is a general...but in the case you are referring the viscosity...or no the same formula...so yes...but in that case you don't have this value...then the boundary condition...on the other hand if you take earlier formula it may become easier...

Post Lunch sessions, supposedly a problem solving session on CFD. This is the most vulnerable session. But the teacher is more interactive, as he sopmetime asks questions! We start off with a typical movement of solid in a melting fluid.
Teacher: I want make you independent, what? independent. and hence I'll not solve the problem. I'll only tell you where in this problem CFD can be used. what? where CFD can be used.
...
Teacher: So you see, composite is always better. What is better? composite.
And our problem solving session, where we learned that CFD can be used to model the melting fluid and composites are better in absorbing shocks thus ends.

Amen.