Your dream presents a rich tapestry of symbolic elements and emotional currents that provide a window into your subconscious mind. Let’s delve into the various aspects of this dream to unfold its deeper meanings.

### Symbolic Analysis

1. **Heaven:**
– Heaven often represents an idealized state of mind, where peace, purity, and ultimate happiness exist. In your dream, this symbolizes a place of refuge and tranquility, perhaps reflecting your desire for peace and contentment in your waking life. As someone who is retired and possibly reflecting on past experiences, heaven might also symbolize a contemplative phase wherein you are seeking understanding and meaning.

2. **The Man Who Knew You:**
– The man you spoke with in heaven serves as a spiritual guide or an aspect of your inner self. His assertion that he knows you suggests an intimate connection, possibly embodying a deeper part of your psyche or a long-forgotten aspect of your own identity. This person could represent wisdom, past experiences, or inner knowledge that is trying to communicate important truths to you.

3. **The Story of Drowning:**
– When the man reveals that his mother drowned him, the imagery of drowning may relate to feelings of being overwhelmed or suppressed. Water, in dream symbolism, often represents emotion, and drowning can signify being consumed by emotions or past traumas. Since the man shares the name of your grandson, it might also reflect generational concerns or fears surrounding family and protection.

### Emotional Context

Your emotions during the dream—confusion and the subsequent feeling of being unsettled upon waking—highlight an internal struggle or unresolved issue. The connections to family, especially the poignant detail of your grandson’s name, amplify concerns about your loved ones and perhaps fears for their well-being. Given that you rarely recall dreams but this one stood out, it seems to carry significant weight in your subconscious, prompting you to introspect on your emotional bonds and future hopes for your family.

### Psychological Insight

At a psychological level, this dream may be touching on deeper layers of your psyche. The narrative of drowning could symbolize buried emotions or repressed fears surfacing to seek resolution. This theme is accentuated by the fact that you are in a period of life where introspection is natural. Your recent mood being calm, despite moderate stress and poor sleep quality, suggests an underlying resilience yet an unaddressed emotional load. The dream symbolizes a call to reconcile with past experiences or latent anxieties that might be affecting your peace of mind.

### Practical Advice

1. **Reflect on Emotional Burdens:**
– Engage in self-reflection to identify any suppressed feelings or unresolved issues. Writing in a journal about your past experiences and emotions might help in untangling these threads.

2. **Strengthen Family Connections:**
– As family is a recurrent theme in your dreams, consider spending more time with your loved ones, ensuring open communication and expressing your care. Sharing stories from your life could create deeper bonds and alleviate unspoken concerns.

3. **Seek Emotional Balance:**
– Practices such as mindfulness meditation or breathing exercises can help in managing stress and improving sleep quality. These practices might also enable you to achieve a more profound sense of mental tranquility, akin to the peaceful heavens in your dream.

4. **Consult a Therapist:**
– If the dream’s emotional undercurrents persist, consulting a therapist could provide professional guidance in exploring and resolving deeper psychological issues. This step could be particularly beneficial if you suspect that buried traumas or emotions are affecting your present well-being.

In essence, this dream appears to be a nudge from your subconscious, guiding you towards a deeper understanding and resolution of your inner emotional landscape. By paying heed to these messages and taking proactive steps in addressing emotional and psychological aspects, you pave the way for a more harmonious and peaceful future.